Patents by Inventor Carol B. Berman

Carol B. Berman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cyclic polycarbonate oligomers: inhibition of polymerization to linear polycarbonates
    Patent number: 4839462
    Abstract: Substituted phenols and phenyl carbonates derived therefrom, such as 2,4-dinitrophenol and 2,4-dinitrophenyl carbonate, are employed to inhibit the formation of linear polycarbonates from cyclic polycarbonate oligomers. Inhibition of polymerization initiated by impurities in the cyclics is noted. When polymerization is effected by basic polycarbonate formation catalysts, the phenols or phenyl carbonates decrease reaction rate.
    Type: Grant
    Filed: August 14, 1987
    Date of Patent: June 13, 1989
    Assignee: General Electric Company
    Inventors: Thomas L. Evans, Carol B. Berman
  • Cyclic polycarbonate oligomers: inhibition and control of polymerization to linear polycarbonates
    Patent number: 4831001
    Abstract: Lewis acids such as triphenyl borate, triphenylborane and aluminum isopropoxide are employed to inhibit or control the formation of linear polycarbonates from cyclic polycarbonate oligomers. Inhibition of polymerization initiated by impurities in the cyclics is noted. When polymerization is effected by basic polycarbonate formation catalysts, the Lewis acids can act as reaction rate accelerators or inhibitors depending on reaction parameters.
    Type: Grant
    Filed: July 11, 1988
    Date of Patent: May 16, 1989
    Assignee: General Electric Company
    Inventors: Thomas L. Evans, Carol B. Berman
  • Cyclic polycarbonate oligomers: inhibition and control of polymerization to linear polycarbonates
    Patent number: 4816548
    Abstract: Lewis acids such as triphenyl borate, triphenylborane and aluminum isopropoxide are employed to inhibit or control the formation of linear polycarbonates from cyclic polycarbonate oligomers. Inhibition of polymerization initiated by impurities in the cyclics is noted. When polymerization is effected by basic polycarbonate formation catalysts, the Lewis acids can act as reaction rate accelerators or inhibitors depending on reaction parameters.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: March 28, 1989
    Assignee: General Electric Company
    Inventors: Thomas L. Evans, Carol B. Berman
  • Cycle polycarbonate oligomers: inhibition and control of polymerization to linear polycarbonate with Lewis acid
    Patent number: 4746726
    Abstract: Lewis acids such as triphenyl borate, triphenylborane and aluminum isopropoxide are employed to inhibit or control the formation of linear polycarbonates from cyclic polycarbonate oligomers. Inhibition of polymerization initiated by impurities in the cyclics is noted. When polymerization is effected by basic polycarbonate formation catalysts, the Lewis acids can act as reaction rate accelerators or inhibitors depending on reaction parameters.
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: May 24, 1988
    Assignee: General Electric Company
    Inventors: Thomas L. Evans, Carol B. Berman
  • Method for polymerizing cyclic polycarbonate oligomers with catalyst comprising polymer containing alkali metal phenoxide moieties
    Patent number: 4701519
    Abstract: Cyclic polycarbonate oligomers are polymerized to linear polycarbonates by contact with a catalyst comprising a polymer containing alkali metal phenoxide moieties. Said polymer is preferably a polycarbonate and the alkali metal is preferably lithium. The catalyst polymer may be prepared by the reaction of a polymer with phenolic moieties with an alkali metal base such as lithium phenoxide at a temperature in the range of about 200.degree.-300.degree. C.
    Type: Grant
    Filed: December 15, 1986
    Date of Patent: October 20, 1987
    Assignee: General Electric Company
    Inventors: Thomas L. Evans, Carol B. Berman
  • Flame retardant polyphenylene oxide thermoplastics
    Patent number: 4584332
    Abstract: Flame retardant blends of styrene and polyphenylene oxide are provided resulting from the use of a mixture of zinc oxide and a triorganothiophosphate.
    Type: Grant
    Filed: September 17, 1984
    Date of Patent: April 22, 1986
    Assignee: General Electric Company
    Inventors: John J. Talley, Carol B. Berman